I have no clue what happened. Honestly.

SO! I come back from a long day of Thanksgiving goodness, want to finish the night with a couple matches. Then it hits me. My League start up is gone from my desktop. I think "that's funny, probably just a bug." It was a bug alright. I checked my files, and League wasn't there at all... Any idea what happened, because this incident has never occurred on any game I've played.